On Sun, 2004-07-11 at 02:47, Donald Ray Lott wrote: > MAC are embedded into each NIC. Each company/brand has it's own > numbering prefix and every NIC number is surposed to be unique. No other > NIC in the world will have another NIC's MAC. > This is "in fact" true (hardware wise). However, Linux allows the network interface to masquerade with a different mac address than the physical embedded address. Another point of fact though, is that a NIC can never have more than one MAC address at a time, regardless of whether it is the physical address or the masqueraded one.